[gdal-dev] georeferenced but not georeferenced?

[Even Rouault]

Le 10/11/2021 à 22:03, Matt.Wilkie at yukon.ca a écrit :
> Hi all,
>
> I'm creating images from SPOT6/7 archive DIMAP format. The resulting images display in the correct position in the world when combined with other sources, however all the usual tools say the images have no georeferencing.
>
> * If the images have no georeferencing how do ArcMap/Pro and Qgis know to put them in the right place?

Those images have RPC. You can see RPC information with gdalinfo in the 
"RPC Metadata" section

listeo/geotiffcp and a number of utilities are not RPC aware. But 
gdalwarp is.

> * How can I convert whatever-this-is into proper georeferencing so that other tools know how to handle them too?
You can use gdalwarp to orthorectify them.  You should generally specify 
-to RPC_DEM=some_dem_with_elevation_as_ellipsoidal_heights or -to 
RPC_HEIGHT=ellipsoidal_height. See 
https://gdal.org/api/gdal_alg.html?highlight=rpc_dem
>
> Attached is a sample image.  It was created with (on one line):
>
>      gdal_translate  -outsize 100 0
>      -co compress=zstd -co predictor=yes -co level=17 -co bigtiff=yes -of cog
>      .\path\to\IMG_SPOT6_MS_001_A\DIM_SPOT6_MS_201609082010410_SEN_1.XML
>      source_tiny.tif
>
> The biggest problem this causes me at the moment is that gdal_pansharpen.py output does not have any kind of goereferencing, and I can't use old faithfuls like listgeo, geotiffcp, or gdalcopyproj.py to copy the coordinate system across.
>
> thanks in advance for your thoughts,
>
> Matt Wilkie
> Geomatics Developer & Administrator
> Environment | Technology, Innovation and Mapping
> T 867-667-8133 | Yukon.ca
> Hours: 08:30-16:30, Mon-Wed: Office, Thu: Remote, Fri: Away.
>
>
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